Electric hoist.



W. 0. DUNTLEY.

ELECTRIC HOIST.

APPLICATION FILED JULY 30, 1907. 910,798. Patented Jan. 26. 1909.

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.W. O. DUNTLEY.

ELECTRIC HOIST. APPLIUATION FILED JULY 30, 1907.

Patented Jan. 26.1909.

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ELEOTRIG HOIST.-

APPLICATION FILED JULY 30, 1907..

Patented Jan. 26, 1909.

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W. O. DUNTLEY.

ELECTRIC HOIST; APPLICATION FILED JULY 30, 1907.

Patented Jan. 26,1909.

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ELEGTRIG HOIST.

APBLIOATION'PILBD JULY 30, 1907.

Patented Jan. 26. 1909.

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ELECTRIC HOIST,

APPLICATION I'ILED JULY 30, 1907. 910,798. Patented Jan.26,1909.

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Patented Jan. 26. 1909.

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ELEGTBIG HOIST.

APPLIOATION rum) JULY 30, 1907.

Patented Jan. 26, 1909.

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ELEOTBIO 110m. APPLICATION IILED JULY 30,1907.

910,798. Patented Jan. 2 1909..

W. O. DUNTLEY.

ELEGTRIG HOIST.

nruonzon rum) JULY 30, 1907.

Patented Jan. 26. 1909.

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attain W. O. DUNTLEY.

ELECTRIC HOIST.

APPLICATION FILED JULY 30, 1907.

910,798. Patented Jan. 26, 1909.

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W. O. DUNTLEY.

ELECTRIC HOIST.

APPLICATION FILED JULY 30, 1907.

91 0,798. Patented Jan. 26. 1909.

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W- 0. DUNTLEY.

v ELECTRIC HOIST. APPLICATION FILED JULY 30, 1907.

910,798. Patented Jan. 26, 1909.

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UNITED STATES PATENT OFFICE.

WILLIAM O. DUN'ILEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO CHICAGO PNEUMATICTOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

ELECTRIC HOIST.

Specification of Letters Patent.

Patented Jan. 26, 1909'.

To all whom it may concern: I

Be it known that I, WILLIAM O. DUNTLEY, a citizen of the United States,residing at Chicago, county of Cook, State of Illinois, have invented anew and useful Electric Hoist, of which the following is aspecification.

My present invention comprises a novel construction of an electric hoistin which a plurality of motors are employed whereby I am enabled toemploy motors of a lighter construction and to drive the motors at amuch higher peed than is possible where a single motor is used.

It further consists of a novel and simplified construction of motorcontrolling mechanism which provides an accurate control of the motorunder allconditions which arise in practice and by the employment ofwhich a ynamic brake may be applied of sufficient power to bring to restand to maintain stationary at an desired time the mechanism operated byt e'motors.

It further consists of novel means for automatically returning thecontrolling mechanism to its neutral position.

It further consists of a novel construction and arrangement of the hoistproper, the motors and the controlling mechanism which forms a concreteunitary structure of simple and compact construction and which at alltimes may be easily and readily controlled by the operator.

It further consists of the novel construction of hoisting mechanism witha lurality of electric motors in series or para lel, said motors havingpower transmission devices common thereto and to the drum shaft of saidhoisting mechanism, which so far as I am aware is wholly novel with me.

It further consists of a novel controlling device for starting andreversing the motors,

1 wherein I employ a movable bonnet, which carries contact devices,whereby the circuitis opened and closed for effecting the properactuation of the motors according to requirenients and a shunt circuitis created when a dynamic brake is to be applied.

In my novel construction I produce series fields in which the magnetismpasses through each motor so that the motors run at a uniform speed.

It further consists of a novel construction of controlling mechanism inwhich the fields are excited or magnetized at all times.

It further consists of novel means for effecting the lubrication of themoving partswithout affecting the electrical mechanism of the hoist.

It further consists of a novel constructionof controlling mechanism inwhich all of the wires are stationary. I

It further consists of a novel construction and correlation of motorsand controlling mechanism therefor in which one set of wirings isemployed for both 110 and 220 volts, and permitting a varied speed to beattained. I It further consists in roviding suitable connections forexciting the field of the motors and short circuiting the armatures,constituting thereby an effective dynamic brake.

It further consists of other novel features of construction, all as willbe hereinafter fully set forth.

For the purpose of illustrating my invention, I have shown one form of adevice, since this embodiment has been found in practice to givesatisfactory and reliable results, although it is to be understood thatthe various instrumentalities of which my invention consists can bevariously arranged and organized and that my invention is not limitedtothe precise arrangement and organization of these instrumentalities asherein set forth.

Figure- 1 represents a perspective view of a two motor electric holstembodying my invention. Fig. 2 represents a sectional elevation of mydevice, certain parts thereof be ing removed for the sake of clearnessof illustration. Fig. 3 representsa front elevation of Fig. 2 partly intransverse section. Fig. 4 represents an enlarged sectional elevation ofa portion of the'hoist showing more clearly certain parts of thecontrolling mechanism when the hook block is stationary. Fig. 5

represents an enlar ed sectional elevation showing certain of t e partsseen in Fig. 4 when the hook block is goin up. Fig. firepresents anenlarged sectiona elevation showing certain of the parts seen in Fig. 5'when the hook block is going down. Fig. 7 represents a sectional view ofFig. 4, certain parts being removed for the sake of clearness ofillustration. Fig. 8 represents a diagrammatical view showing theconnections for a circuit of 110 volts. Fig. 9 represents adiagrammatical view of the wiring for 110 volts when the hook blockisbein g raised. Figi 10 represents a diagram of the wiring for 110volts when the hook block is being lowered. Fig. '11 represents a die amof the wiring for 110 volts when the hoo block is stationary and thedynamic brake is a plied. Fig. 12 represents a plan view 0 the insulatedring showing the contacts thereon. Fig. 13 represents a diagrammaticalview in simplified form showing the wiring for 110 volts when the hookblock is going up. Fig. 14 represents a diagram of the wiring for 110volts, in a simplified form, when the hook block is going down. Fig. 15represents a diagrammatical view showing the wiring for 110 volts whenthe hook block is stationar and the dynamic brake is being applied. ig.16 represents a dia rammatical view of the wiring for 220 v0 ts when theparts are in their neutral position. Fig. 17 represents a dia am of thewiring for 220 volts when the hoo block is being raised. Fig. 18represents a diagram of the wirin fer 220 volts when the hook block isbeing owered. 19 represents a dia ram of the wiring for 220 -volts whenthe hoo block is stationary and the dynamic brake is being applied. Fig.20 represents a diagram, in simplified form, of the Wiring for 220 voltswhen the hook block is going up. Fig. 21 represents a diagram, insimplified form, of the wiring for 220 volts when the hook block isgoing down. Fig. 22 represents a diagram of the wiring for 220 voltswhen the hook block is stationar and the dynamic brake is being applie,Fig. 23 represents a lan View of the stationary contact mem er and itscontacts. Fig. 24 represents, in detail elevation, the pinions of thearmature shafts meshing with a common pinion forming part of thetransmission mechanism. Figs. 25, 26 and 27 show diagrammatically theelectrical connections for attaining two speeds.

Similar numerals of reference indicate correslponding parts in thefigures.

eferrin to the drawings, in order to more clear y describe my invention,I will describe in sequence the hoist proper, the manner-in which it isconnected with the motors, the electric motors, the switch mechanism forcontrollin the motors and the wiring for difierent v0 tages.

1 designates the hoist frame or casing com-' prising in the presentinstance the casing members 2 and 3 which are adapted to be securedtogether by any suitable fastening devices.

4 desi nates the drum shaft journaled in the mem ers 2 and 3 and onwhich is mounted the worm wheel 5, it being noted that said wheel is comletely inclosed in the present instance by t e casing members 2 and 3.

6 and 7 designate drums mounted on the shaft 4 on op osite sides of'theworm wheel 5 said drums eing maintained in assembled position by meansof nuts or equivalent fastening devices 8.

9 designates the worm shaft having the Worm 1O thereon which meshes withthe worm wheel 5, said shaft being journaled in bearings 11 and 12carried by the casing 1, it being noted that in the present instance asuitable ball bearing or antifriction device 13 is provided, as is mostclearly indicated in Fig. 2 of the drawings; similar antifriction meansmay be provided in journal 12.

In In present constructlon, the worm is adapte to be driven by twomotors and the pinion 14 meshes with a pinion on each armature shaft, asis clearly seen in Fig. 24.

15 designates the motor casing which is secured with respect to thecasing 1 in any suitable manner and in the )resent construction a brace16 is preferabl y employed, one end of which is secured to the casing15, the other end thereof being secured to the casin 1.

17 designates a bearing suitably carried by the casing 15 and in whichone end of the worm shaft 9 is-journaled.

18 designates the upper hook which passes through an a ertured ortion ofthe casing 1 and is suitab y secure with respect thereto by means of anut or equivalent fastening device 19, it being noted that a ballhearing or antifriction device 20 is interposed between the nut 19 andthe casing 1.

21 designates a cable which is secured to the drums 6 and 7 and passesthrough the block 22 in which is secured the hook 23 in a manner similarto that already described with reference to the upper hook-18.

24 designates one of the armatures and 25 designates the field therefor,it being understood that in the present instance, two armatures areemployed, the shafts of which are suitably j ournaled within the casing15.

26 designates the casing for the controlling mechanism, which is securedto the casing 15 by means of suitable fastening devices such as thebolts 27.

28 designates a shaft which, as most clearl seen in Fig. 7, hasthreadedengagement wit the enlargement 29 of the member 26, any impropermovement being prevented by means of the lock nut 30, it being notedthat the shaft 28, has at its outer end, an enlargement 31, the purposeof which will hereinafter appear.

32 designates a collar which is secured to the member 26 by means of thefastening devices 33 and 34.

35 designates a ring of insulating material 'movably mounted on thestationary member 32 and to which the different contacts are secured.

36 designates a contact piece secured to the ring 35, and 37 designatesanother contact piece which is secured to the member 35, it being noted,as most clearly seen in Fig. 4, that the ring 35 has an extension or lug38 at its outer periphery which when the parts are norms in museposition is adapted to b5 seated in mitablereoesses-in the bonnet 39,whereby said ring 35 and bonnet 39 move in unison.

43- designates a stationary ring of insulating material secured by meansof suitable fastening devices such as screws 44 to the stationar member32, said ring 43 having secured t ereto the s ring contacts 45-and 46and the contact b ades 47 and 48. The movable ring 35 has securedthereto the negative contact pieces 49 and 50.

51 designates a collar fixed to the bushing 40 in any suitable mannerand having an extension 52 in which a stud 53 is mounted which is adated to engage a slot 54 in the link 55, whic latter is pivoted atone-end as at 56 to a rock arm 57 mounted on a rock shaft 58to'whichlatter is also secured a rock arm 59 which is located in the athof the hook block 22, as will be best un erstood by reference to Figs. 4and 7.

60, 61 and 62 designate recesses or seats in the bonnet 39 in which theball 63 is adapted to be seated at certain times to prevent improperrotation of the bonnet 39. As seen in Fig. 7, the ball 63 is maintainedin place by means of the engagement therewith of the free end of aspring 64, said spring being secured at 65 to the stationary member 26.

66 designates a casing or cover secured by means of suitable fasteningdevices such as the screws 67 to the stationary. member 26, whereby anyforeign material is revented from coming into contact with the all 63.

68 designates a hook to which a cord 69 is secured, said cord beingprovided with a suitable handle and also, if desired, with a diskshowing the direction in which the cord is actuated to operate thehoist.

70 designates a hook similar to the hook 68 and secured to the bonnet39, said hook having secured thereto an actuating cable or cord 71provided with'a suitable actuating handle and also, if desired, with adisk showing the direction in which said cord is to beactuated.

It will be readily seen that, if desired, any suitable antifrictionmeans could be provided for to relieve the friction when manipulatingbonnet 39 and ring 35.

72 and 73 designate drum covers which aresecured to the casing members 2and 3 respectively.

he casing 15 is deflected as indicated at 74 in- Fig. 2 and providedwith lateral apertures 75 through which the line wires pass. By thisconstruction the liability of any moisture or dampness entering themotor casing is reduced to a minimum.

It is to be especially noted that owing to the manner in which the motorcasing 15 is connected with the casing 1 of the hoist .proper a chamber88 is formed in which is a ocated the pinion 14 and the pinions in thedifferent armature shafts, it bein understood that this chamber isadapte to contain any suitable lubricating material such as a thickgrease, whereby the parts willbe vproperly lubricated under allconditions and there is no liability of any of the lubricating materialpassing to the different motors since, as a ove stated, the pinions andgears are located in a separate chamber. A chamber is also formedin thecasing 1 in which the worm is journaled and which may be filled with anysuitable lubricating material in order that the worm and the worm wheelwill be properly lubricated at all times;

Referring now to Figs. 8 to 15 inclusive, I will describe the manner inwhich the circuit is formed when 110 volts are em )loyed and also showthe manner in which the different circuits are formed during thedifferent positions of the switch. I will explain the manner in whichthe circuits are formed when the hoist is going up, the manner inwhiclrthe circuit is formed when the hoist is going down and third, themanner in which the hoist is brought to rest and maintained in astationary position.

76 and 77 designate the different line wires which lead to the bindingposts 78 and 79 respectively. In the present instance I have shown twooommutators 80 and 81 as bein employed, in conjunction with which isused a novel construction of fields 82 and 83.

84 and 85 designate brushes for the commutator 80 and 86 and 87designate brushes for the commutator 81.

89 designates a wire leading from the binding post 78 and passing'aroundthe field 82, thence by Wire 96 across to oin wire and thence to springcontact 46, the other series wire 94 in parallel therewith, passingaround the pole piece 83 and thence by wire 95 to join wire 96 andfinally to spring contact 46. The wire 90 of the shunt field passesaround the field 82, thence joins wire 101 by wire 93, and finally tobinding post 79. The wire 91 in parallel with wire 90 passes around polepiece 83, thence by wire 92 joins wire 93, and finally to binding post79. The brush 85 is connected by the wire 97 with the contact blade 47.The brush 85 is also connected by means of the wire 98 with the brush86. The brush 84 is connected by the wire 99 with the brush 87 and thebrush 87 is connected by the wire 100 with the contact blade 48. Thespring contact 45 is connected by means of t e wire 101 to the bindingpost 79.

102 designates a short circuiting or low resistance wire leadin from theneutral contact 49 to the neutra contact 50. This wire is located in agroove 113 in the ring 35 and is embedded in suitable insulatingmaterial, as will be clearly understood from Figs. 4 and 7.

I will now explain the manner in which the circuit is formed when thehoist block is going up, which will be clearly understood from Fig. 9.The current passes through the line wire 76 to the wire 89 of the aseries field by the wire 96 and also through wire 94 of the 1) seriesfield to the wire 95, thence to the spring contact 46 and since the artsare now in the position indicated in Flg. 9, the current will flow fromthe spring contact 46 to the contact 36 carried by the movable ring 35,thence throu h the contact blade 47 to the wire 97 to the rush 85 whichis connected by the wire 98 to the brush 86, thus gassing through thearmatures in paraliel.

he current passes through the brushes 84 and 87 and by means of wires 99and 100 to the contact lade 48, thence through the contact 37 to thespring contact 45, thence through the wire 101 to the line 77, it beingunderstood that the line wires 76 and 77 are connected by the shunt,circuits 90, 93 and 91, 92, thereby connecting the shunt fields inparallel. The shunt circuit eomprisin the wire 90 passes through c?shunt fiel and is connected by the Wire 93 with the line 77 and theother shunt circuit passes through the wire 91 to the d shunt field andconnects by means of the wire 92 with the line wire 77.

The above shows the shunt fields coupled in parallel, and the seriesfields and armatures also in parallel with each other.

In Fig. 10, I have indicated the manner in which the current passes whenthe motors are reversed. The current from the wire 76 passes by the wire89 throug a, series field to the wire 96 and passes by means of the wire94 and the b series field to the wire 95, the wires 95 and 96 beingconnected with the spring contact 46 which is in engagement at this timewith the movable contact 36, so that the current passes from the contact36 to the contact blade 48 thence by the wire 100 to the brush 87 and bythe wire 99 to the brush 84. The current then passes from the brushes 86and 85 by means of the wires 98 and 97 to the contact blade 47, which inthis position is in engagement with the movable contact 37 and since thespring contact 45 at this time is in engagement with the movable contact37, the current will ass to the s ring contact 45 and therefrom by means0 the wire 101 to the line 77. The shunt fields c and d are excited bycurrent taken from line 76 to wire 90 which then asses through c fieldand communicating y means of 93 with the line 77 and by means of thewire 91 passes through the d shunt field and communicates by means ofthe wire 92 with the line 77 In this position the only change betweenthat seen in Fig. 9 is that the current is furnished to the armatures inthe opposite direction.-

When it is desired to stop the motors the ring 35 is moved to thepos1tion seen in Fig. 11 at which time the series field is opened, the

shunt field remaining active, the armatures simplified form the mannerin which the circuit is formed when the switch is in each of its threepositions, correspondin to Figs. 9, 10 and 11, res ectively. It'wll benoted that the simplii ication is made by omitting the showing of theswitch per see.

In Figs. 16 to 22 inclusive, I have shown the manner in which thedifferent circuits are forlmed when the hoist is being used with 220 v0ts.

The only changes in the method of connection in case a circuit of 220volts is employed, are that the armatures and fields are arran ed inseries with each other instead of para lel with each other as used inthe 110 circuit. The detail connections necessary to eifect thisarrangement will be clear from the description-of Figs. 16 to 22 whichfollows.

It is within the S00 e of my invention to rovide my device witi mgswitch whereby the various changes in the connections are readil madewithout dismantling the bonnet. his feature will be described in detaillater.

In Fi 17, I have shown the manner in which t e parts are electricallyconnected when the motors are running in a direction to cause the footblock to be raised. The current passes from the wire 76 by wire 106through the a, series field, then by wire 107 to the b series field,then by wire 108 to 1 a simplified connectthe spring contact 46, thenceby contact 36 to the contact blade 47 thence by wire 109 to brush 84.The current now passes from brush 85 by wire 110 to brush 87 and thencefrom brush 86 by wire 111 to contact blade 48, thence by contact 37 tospring contact 45, thence by wire 112 to line 77. The shunt fieldderives its current from line 76 from wire 103, through c field, then byWire 104 through d field, then by wire 105 to line 77. This positiongives us the shunt fields in series with each other, the series fieldsin series with each other and the armature in series,

volts as used on-110 volts circult.

vmovable blades are rotated anti-c with two speeds.

amma field, thence by wire. 108 to spring contact 46. The current passesfrom springcontact 46 b removablecontact 36, thence to contact blade 48to wire 11.1 and thence to brush 86. The current now passes from brush87 by wire 110 to brush 85, thence by brush 84 by wire 109 to contactblade 47, thence by movable contact 37 and spring contact 45 by wire 112to line 77.

The current in the shunt field passes from line 76 by wire 103 to cfield, thence by wire 104 through d shunt field, and thence by wire 105to line 77.

The only change between the views shown in Fig. 18 and that seen in Fig.17 is that the armatures receive, their current in the oppositedirection.

When it is desired to stop the motors, the

35 is moved to the position seen in Fig. 19 m which position the seriesfield is open, the shunt field remaining active, the armatures are shortcircuited and the current flows from the brush 84 by wire 109 to springcontact 47 thence to neutral contact 49, by wire 102 to the neutralcontact 50, spring contact 48, wire 111, brush 86 to brush 87 by wire110 to brush 85, to brush 84.

I will now explain how the connections are made when it is desired tooperate my hoist As will be seen from Fi s. 25, 26 and 27 the switch issimilar to that de scribed above, excepting that the switch blades aremoved and the contacts are stationary. It is to be noted that thearmatures of the motors are wound for maximum volt e.

Re er g particularly to Fig. 25, 200 and 201 represent the electricalsupply wires. Wire 200 is connected directly wit one brush of onearmature, designated A, supplying current thereto; wire 200 also makesconnection with fixed contact 203. Current is led from the other brushof motor A b wire 204 to one of the movable contact b ades 205. Contactblade 206 is connected with one brush of the motor B by wire 208. Theother brush of motor B is in connection with line 201 and also withfixed contact 209 by wire 210. The opposite fixed contacts 211 and 212are short circuited by coil 213.

When it is desired to use the low speed the ockwise so that blade 206contacts with 212 and blade 205 with 211. The armatures of motors A andB are thus connected for low speed, as shown more clearly in Fig. 27.

When a high s eed is desired the contact blades are rotate clockwise andthe current passes in parallel through the armature circuits thenceby201.

In'so far asI am aware, I believe that I am the first in the art todevise the combination -.of a plurality of motors having common fieldcores, a plurality of armatures, means for maintaimng a constantdirection. of flux through-the cores and means for controllingIbyconnections 200, .202, 206, its as the direction of current fiowthrough the ar-\ matures. In addition, I believe it is novel with me todevise a lurality of motors to simultaneously drive by suitable gear acommon shaft and thereby actuate the winding mechanism.

In so far as I am aware, I am the first in the art to devise an electrichoist in which a plurality of motors are em 10 ed and in which a seriesfield is employed w ich is common to both armatures and it is to beunderstood that my claims to these features are to be interpreted withcorres ending scope. By this arrangement of a urality of motors, I amenabled to get a higher speed than by the usual construction, since thesmall diameters of the motors enable them to be run at high speeds.

Furthermore, it will be seen that I derive great advantages in myelectric hoist by em ploying a worm andworm shaft intermedi-- ate thehoistin means and gearing of my motors, especia ly in combination withelectrical'means for efiecting a dynamic brake, specifically bymaintaining a flux through t e field cores and short-circuiting thearmature circuits.

Attention is again directed to the lurality of winding drums locatedupon eit her side of a gear and all u on a common shaft, whereby acompact ioisting mechanism is obtained which receives its power directlyat the lifting oint and furthermore a structure is provi ed particularlywell adapted for portability.

' It will now be apparent to those skilled in this art that I havedevised a novel and useful construction of electric hoist which embodiesthe features of advantage enumerated as desirable in the statement ofinvention and the above descri tion and while I have, in the presentcase, s own and described the referred embodiment thereof which has eenfound in practice to give satisfactory and reliable results, it is to beunderstood that it is susceptible of modification in various particularswithout departing from the spirit and scope'of the invention orsacrificing any of its advantages.

Having thus described my invention, what I I claim as new and desire tosecure by Letters gearing for said armatures, an auxiliary shaft secureto said motor casing, a lurality of contacts mounted on said auxi iaryshaft, and means for shifting said contacts.

2. In a device of the character described, a

rality of motor armatures, a field magnet common to said armatures,transmission gearing1 for said armatures, an auxiliary shaft secure tosaid motor casing, a plurality of contacts mounted on said auxiliaryshaft, a casing for said contacts, a trip arm adapted to shift saidcontacts, and means to lock said contacts in shifted position.

4. In adevice of the character described, a hoisting mechanism, a shaftoperating said hoisting mechanism, a plurality of motors. a motorcasing, shafts for said motors extending outside of said motor casing,intermediate gears upon the hoisting shaft, a shaft secured to saidmotor casing, a lurality of contacts mounted on said sha t, a casing forsaid contacts, and means to shift said contacts. I

5. In a device of the character described, a hoisting mechanism, a shaftoperating, said hoisting mechanism, a plurality of motors, a motorcasing, shafts for said motors extending through said motor casing,intermediate gears upon the hoisting mechanism shaft, and upon the motorshafts, an auxiliary shaft secured to said motor casing, a plurality ofcontacts mounted on said auxiliary shaft, a casing inelosing saidcontacts, and auto matic means for shifting said contacts.

6. In a device of the character described, a hoisting mechanism, a shaftoperating said hoisting mechanism, a plurality of motors, a motorcasing, shafts for said motors, intermediate gears u on the hoistingmechanism shaft and upon die motor shafts, an auxiliary shaft secured tosaid motor casing, a )lurality of contacts on said auxiliary sha t, acasing for said contacts, a trip arm adapted to shift said contacts, andmeans to lock said contacts in shifted position.

7. In a device of the character described, a hoisting mechanism, a shaftoperating said hoisting mechanism, a plurality of motors, a motorcasing, shafts for said motors, intermediate gears upon thehoistingmechanism shaft and upon the motor shafts, an auxiliary shaft, securedto said motor casing, a disk having a plurality of contacts mounted onsaid shaft,

a casing for said disk, connections between said disk and easing, armson said casing whereby said disk may be shifted, and means to lock saiddisk in shifted osition'.

8. In a ortable electric iioist, one or more drums, a riving shaftactuating said drums,

a casing, a plurality of motor armatures, a

field magnet common to said armatures, power transmission meanssymmetrically mounted with respect to said shaft, and an oscillatingbonnet on said easin for electrically controlling the rotation 0 saidarmatures.

9. A portable electric hoist adapted to be A suspended, a plurality ofwinding drums, a driving'shaft actuating said drums, a casing, aplurality of motor armatures, a field magnet common to said armatures,transmission gearing for said armatures, an oscillating bonnet on saidcasing for electrically controllin the rotation of said armatures, alurality 0 arms on said bonnet for manua operation thereof, and a triparm for automatic operation of said bonnet.

10. In a portable electric hoist, a casing, a drum shaft therein, drumsada ted to be driven by said shaft, a plurality o motors, a transmissiongearing adapted to drive said shaft and symmetrically arranged in saidcasing relative to said shaft, a contact disk su sai disk.

11. In a portable electric hoist, a casing, a drum shaft therein, drumsadapted to be driven by said shaft, a plurality of motors, atransmission gearing adapted to drive said shaft and symmetricallyarranged in said casing relative to said shaft, a contact disk securedto said casing, means to oscillate said contact disk, and means to holdsaid disk in fixed position.

12. In a portable electric hoist, a casing, a

drum shaft therein, drums adapted to be driven by said shaft, aplurality of motors, a transmission gearing adapted to drive said shaftsymmetrically arranged in said casing, relative to said shaft, a contactdisk supported by said casing, a rin inclosin sa1d disk, means tooscillate sai disk an ring together, and means to hold said ring infixed position.

13. In aportable electric hoist, a winding device, a shaft; to whichsaid winding device is secured, a gear fast on said shaft, a drivinshaft mounted in suitable bearings located below said gear and windindevice, a worm on said driving shaft in mesh with said gear, a gearmounted on said drivin shaft, pinions engagin said last mentions gear, aplurality of shafts on which said pinions are orted in said casing, andmeans to lock

